Minus the area of doors and windows: 59-1* 2-2 *1.5 = 59-2-3 = 54 square meters.
Paint used: 0.9 * 54 = 48.6kg.
Amount of money needed: 32*48.6= 1555.2 yuan.
Answer: Cong Cong needs 1555.2 yuan to finish painting his room.